SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9113127fd03ab54741b82fe4217e793c89a3c495089d22eb3eb9a9978af76a9f' 
  AND token = 'bGIFGlcWKmkrXH9XsJ1LpYzplJZQPwp1gRVd6Sp0/ds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}